1 /*
   2  * Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
  26 #define SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
  27 
  28 inline intptr_t ObjectMonitor::is_entered(TRAPS) const {
  29   if (THREAD == _owner || THREAD->is_lock_owned((address) _owner)) {
  30     return 1;
  31   }
  32   return 0;
  33 }
  34 
  35 inline markOop ObjectMonitor::header() const {
  36   return _header;
  37 }
  38 
  39 inline volatile markOop* ObjectMonitor::header_addr() {
  40   assert((intptr_t)this == (intptr_t)&_header, "sync code expects this");
  41   return &_header;
  42 }
  43 
  44 inline void ObjectMonitor::set_header(markOop hdr) {
  45   _header = hdr;
  46 }
  47 
  48 inline jint ObjectMonitor::count() const {
  49   return _count;
  50 }
  51 
  52 inline jint ObjectMonitor::waiters() const {
  53   return _waiters;
  54 }
  55 
  56 inline void* ObjectMonitor::owner() const {
  57   return _owner;
  58 }
  59 
  60 inline void ObjectMonitor::clear() {
  61   assert(_header != NULL, "Fatal logic error in ObjectMonitor header!");
  62   assert(_count == 0, "Fatal logic error in ObjectMonitor count!");
  63   assert(_waiters == 0, "Fatal logic error in ObjectMonitor waiters!");
  64   assert(_recursions == 0, "Fatal logic error in ObjectMonitor recursions!");
  65   assert(_object != NULL, "Fatal logic error in ObjectMonitor object!");
  66   assert(_owner == NULL, "Fatal logic error in ObjectMonitor owner!");
  67 
  68   _header = NULL;
  69   _object = NULL;
  70 }
  71 
  72 inline void* ObjectMonitor::object() const {
  73   return _object;
  74 }
  75 
  76 inline void* ObjectMonitor::object_addr() {
  77   return (void *)(&_object);
  78 }
  79 
  80 inline void ObjectMonitor::set_object(void* obj) {
  81   _object = obj;
  82 }
  83 
  84 inline bool ObjectMonitor::check(TRAPS) {
  85   if (THREAD != _owner) {
  86     if (THREAD->is_lock_owned((address) _owner)) {
  87       _owner = THREAD;  // regain ownership of inflated monitor
  88       assert (_recursions == 0, "invariant") ;
  89     } else {
  90       check_slow(THREAD);
  91       return false;
  92     }
  93   }
  94   return true;
  95 }
  96 
  97 // return number of threads contending for this monitor
  98 inline jint ObjectMonitor::contentions() const {
  99   return _count;
 100 }
 101 
 102 // Do NOT set _count = 0. There is a race such that _count could
 103 // be set while inflating prior to setting _owner
 104 // Just use Atomic::inc/dec and assert 0 when monitor put on free list
 105 inline void ObjectMonitor::set_owner(void* owner) {
 106   _owner = owner;
 107   _recursions = 0;
 108 }
 109 
 110 #endif // SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP